689173220501 has 2 divisors, whose sum is σ = 689173220502. Its totient is φ = 689173220500.

The previous prime is 689173220443. The next prime is 689173220503. The reversal of 689173220501 is 105022371986.

689173220501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 540774919876 + 148398300625 = 735374^2 + 385225^2 .

It is a cyclic number.

It is not a de Polignac number, because 689173220501 - 2¹⁰ = 689173219477 is a prime.

Together with 689173220503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689173220503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344586610250 + 344586610251.

It is an arithmetic number, because the mean of its divisors is an integer number (344586610251).

Almost surely, 2^689173220501 is an apocalyptic number.

It is an amenable number.

689173220501 is a deficient number, since it is larger than the sum of its proper divisors (1).

689173220501 is an equidigital number, since it uses as much as digits as its factorization.

689173220501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 689173220501 in words is "six hundred eighty-nine billion, one hundred seventy-three million, two hundred twenty thousand, five hundred one".